Pass through the correct LangVersion to csc

Author: ajaybhargavb

src/Razor/src/Microsoft.NET.Sdk.Razor/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Compilation.targets

@@ -111,12 +111,6 @@ Copyright (c) .NET Foundation. All rights reserved.
       <UseSharedCompilation>true</UseSharedCompilation>
     </PropertyGroup>
 
-    <PropertyGroup Condition="('$(TargetFrameworkIdentifier)' != '.NETCoreApp' OR '$(TargetFrameworkVersion)' != 'v3.0') AND
-                            ('$(TargetFrameworkIdentifier)' != '.NETStandard' OR '$(TargetFrameworkVersion)' != 'v2.1')">
-      <MaxSupportedLangVersion Condition="'$(MaxSupportedLangVersion)' == ''">7.3</MaxSupportedLangVersion>
-      <LangVersion Condition="'$(LangVersion)' == ''">$(MaxSupportedLangVersion)</LangVersion>
-    </PropertyGroup>
-
     <Csc
          AdditionalLibPaths="$(AdditionalLibPaths)"
          AddModules="@(AddModules)"